KR101801607B1 - Adhesive Sheet - Google Patents

Abstract

The present invention relates to an adhesive sheet which is composed of: a non-woven fabric sheet forming a web with staple fibers whose fineness is 3-50 Denier; and an adhesive composition forming a coating layer on a surface of the staple fiber which forms the non-woven fabric sheet. The adhesive composition contains lauric acid; and 5-20 parts by weight of a friction improver consisting of polypropylene glycol or polyethylene glycol with number mean molecular weight of 300-3,000, with respect to 100 parts by weight of a water-soluble acrylic adhesive.

Description

{Adhesive Sheet}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive adhesive sheet, and more particularly, to a nonwoven fabric sheet including a pressure-sensitive adhesive composition so as to more efficiently remove various foreign substances such as dust, debris and hair.

The quality of life of modern people is improving at a very fast pace, and the desire of those who want to live in a clean environment is also rising. At the same time, the advancement of women into the society is becoming common, and in many parts of the household chores where the role of women has been high in the past, the division of men and women has been disappearing, and the time spent on housework has been saved. There are a growing number of people who want to. As a result, robotic vacuum cleaners and smart washing machines have been developed, and existing home appliances are becoming more and more innovative, and there are also a variety of superior cleaning products that can save people time and effort in a simpler way have.

Among them, various cleaning products have been developed so that the most cumbersome and enormous amount of housework wiping can be more conveniently performed, and nonwoven fabric cleaning cloths are widely used. The cleaning cloth is generally fixed to a vacuum cleaner composed of a bag-shaped bag and a non-woven fabric mounting portion provided at an end of the bag. The cleaning cloth is usually formed in the shape of a flat plate having a rectangular structure. The material is mainly composed of PP (Polypropylene), PET Because it is made of the same material polymer, it absorbs the foreign substance such as dust or hair by utilizing the electrostatic characteristic of the polymer itself.

Since such a conventional cleaning nonwoven fabric is a principle of adsorbing foreign matter only by the static electricity of the material itself, the adsorption force against heavy dust or debris is somewhat weak, so there is a limit to cleanly clean. In addition, the conventional cleaning nonwoven fabric is formed by a spunlace method in which most of the fibers are tangled by using high-pressure water, so that there is a problem that the attraction force for foreign matters is somewhat low due to high smoothness. In other words, the foreign matter is swept to one side during cleaning, the foreign matter is not completely removed from the cleaned surface, or even if it is attached to the nonwoven fabric, if the foreign matter is saturated, it is difficult to remove foreign matter. In addition, there is a drawback that it is uneconomical because it is practically impossible to use both sides.

Accordingly, in order to overcome the limitations of the prior art and to increase the suction force of the nonwoven fabric for cleaning, adhesive cleaning pads having an adhesive coated on one side of the base material have recently been developed. However, the adhesive cleaning cloth sticks to the lower base material in which the adhesive surface is wound in the process of providing a winding state, and in order to use the cleaning cloth, there is a risk of product damage such as peeling of the base material during unwinding, Problems can arise. Therefore, it is necessary to use a separate release paper for protecting the adhesive surface, or there is a manufacturing hassle in which the upper surface of the base material must be removed so that the adhesive surface does not adhere to the base material.

On the other hand, Korean Patent Registration No. 1106917 entitled " Adhesive Cleaning Paste and Manufacturing Method Therefor " relates to a cleaning pouch for removing foreign matter by an adhesive or adhesion method other than an electrostatic method. The patent discloses that a pretreatment layer is applied to one side of a base material and then a printing layer and an adhesive layer are sequentially formed on the pretreatment layer to prevent the adhesive layer from being absorbed and permeated by both sides of the base material, And the user can easily grasp the surface to which the adhesive layer is applied by the print layer. However, the adhesive layer has a structure that can not be used on both sides, and can give a feeling of somewhat stiff feeling.

In another prior art, Japanese Patent No. 4187341 as an arc of a hot-melt type adhesive on the non-woven fibers greater than the distance between the "old roll type cleaning" 0.3mm, the elastic modulus at ^{20 ℃ 1 × 10 5 Pa ~} 3 × 10 6 Pa is supported on the surface and inside of the nonwoven fabric so that the pressure sensitive adhesive is leached during use. The present applicant has also disclosed an adhesive cleaning nonwoven fabric prepared by impregnating or spraying a water-soluble adhesive onto a nonwoven fabric formed by needle punching through Korean Patent Application No. 10-2015-0161216 " Adhesive Cleaning Nonwoven Fabric and Method for Manufacturing the Same " have.

In the case of the cleaning cloth prepared by impregnating the nonwoven fabric with the pressure-sensitive adhesive, as compared with the cleaning cloth coated on one side of the nonwoven fabric, the foreign matter removing ability is excellent and the effect of using both surfaces is shown. However, since the use of the pressure-sensitive adhesive agent can not only reduce the feeling of use for gently wiping the cleaning surface, the problem of allowing the user to remove the foreign matter effectively while reducing the power of the pressure- It remains a task to be done.

Accordingly, it is an object of the present invention to provide a pressure sensitive adhesive sheet for cleaning which is excellent in cleaning effect with excellent adhesive properties and can smoothly clean the cleaning surface by improving the frictional force between the cleaning sheet and the cleaning surface.

A preferred embodiment of the present invention for solving the above problems is a nonwoven fabric sheet comprising a web formed by a staple fiber having a fineness of 3 to 50 Denier; And a pressure-sensitive adhesive composition for forming a coating layer on the surface of the staple fibers forming the nonwoven fabric sheet, wherein the pressure-sensitive adhesive composition comprises, based on 100 parts by weight of a water-soluble acrylic pressure-sensitive adhesive, lauric acid; And 5 to 20 parts by weight of a friction modifier mixed with polyethylene glycol or polypropylene glycol having a number average molecular weight of 300 to 3,000.

The polyethylene glycol or polypropylene glycol according to the embodiment may be mixed at a ratio of 50 to 85 parts by weight based on 100 parts by weight of the lauric acid. The adhesive composition may be 10 to 20 parts by weight per 100 parts by weight of the total weight of the non- .

The staple fiber according to the embodiment may be at least one fiber selected from the group consisting of polyester (PET), polypropylene (PP), nylon and rayon, The non-woven fabric sheet according to the present invention may be one having a web formed by needle punching, having a dry weight of 50 to 100 g per unit area (m 2) and a height of 2 to 5 mm.

Furthermore, the pressure-sensitive adhesive sheet according to the above embodiments may be manufactured in one or more of a form wound on a cylindrical winding roll, a layer stacked in a box-shaped mold, and a packed state individually packaged per unit sheet.

According to the present invention, it is possible to improve the frictional force of the pressure sensitive adhesive sheet against the cleaned surface without deteriorating the adhesive property, and to prevent the pressure sensitive adhesive composition from contaminating the production equipment during the production of the pressure sensitive adhesive sheet, Sensitive adhesive sheet can be provided.

Further, since the adhesive sheet according to the present invention has a low frictional force with respect to a cleaning surface, it is easy for a user to clean the sheet with less force, and since the adhesive composition is coated on a staple fiber forming a nonwoven type adhesive sheet, Unlike the conventional pressure sensitive adhesive sheet in which the layer is separately formed, the bulkiness of the nonwoven fabric is maintained, but the content of the pressure sensitive adhesive composition is higher, and the cleaning effect is excellent.

1 is a graph showing a difference in frictional force according to the presence or absence of use of a friction modifier based on the nonwoven fabric sheet having no adhesive component.
Fig. 2 is a photograph showing the result of actual field testing in order to compare the cleaning power and feeling.
Fig. 3 is a photograph showing that a friction-improving agent is stuck on the sheet when the ratio of the friction-improving agent and the water-soluble acrylic pressure-sensitive adhesive in the pressure-sensitive adhesive composition is out of the preferable range of the present invention.

The present invention provides a pressure-sensitive adhesive composition comprising a water-soluble acrylic pressure-sensitive adhesive and a friction modifier, and a nonwoven fabric sheet containing the pressure-sensitive adhesive composition, wherein the pressure-

The pressure-sensitive adhesive sheet of the present invention can be produced by impregnating or spray-treating a nonwoven fabric sheet with a pressure-sensitive adhesive composition, followed by a general process of squeezing and drying. However, Compared with the impregnated pressure-sensitive adhesive sheet, the pressure-sensitive adhesive component does not contaminate the rollers and the like in terms of the manufacturing process, thereby improving the manufacturing efficiency. Further, the addition of the friction modifier allows the pressure-sensitive adhesive component to penetrate more easily between the fibers forming the nonwoven fabric sheet, and ultimately achieves an excellent adhesion property as well as an effect of improving the frictional force gently wiping the cleaning surface.

Hereinafter, the pressure-sensitive adhesive sheet of the present invention will be described in more detail.

The adhesive sheet of the present invention comprises a nonwoven fabric sheet having a web formed by a staple fiber having a fineness of 3 to 50 Denier; And a pressure-sensitive adhesive composition having a coating layer formed on the surface of the staple fibers forming the nonwoven fabric sheet. The pressure-sensitive adhesive composition according to claim 1, wherein the pressure-sensitive adhesive composition comprises: 100 parts by weight of water-soluble acrylic pressure-sensitive adhesive; And 5 to 20 parts by weight of a friction modifier mixed with polyethylene glycol or polypropylene glycol having a number average molecular weight of 300 to 3,000.

In the present invention, the water-soluble acrylic pressure-sensitive adhesive generally refers to an acrylic pressure-sensitive adhesive applied to an adhesive cleaning sheet, but it is a water-soluble acrylic pressure-sensitive adhesive polymerized from an acrylic monomer, a surfactant and an initiator, And 4 to 10 parts by weight of a surfactant and 2 to 7 parts by weight of an initiator. At this time, the acrylic monomer, the surfactant and the initiator may be emulsion-polymerized using water as a solvent, but the present invention is not limited thereto.

The acrylic monomers include, for example, (i) alkyl (meth) acrylic acid ester monomers; And (ii) an unsaturated carboxylic acid and a hydroxyl group-containing unsaturated monomer, and the acrylic monomer may be contained at a weight ratio of 9: 1 to 7: 3 for effective adhesion, but is not limited thereto.

However, the alkyl (meth) acrylate monomer (i) is preferably selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl , Isobutyl acrylate, t-butyl methacrylate, pentyl methacrylate, hexyl methacrylate, heptyl acrylate, isooctyl acrylate, octyl methacrylate, 2-ethylhexyl acrylate, isodecyl acrylate, decyl Methacrylate, dodecyl methacrylate, and isobornyl methacrylate, and (ii) unsaturated carboxylic acid and hydroxyl group-containing unsaturated monomer may include acrylic acid, itaconic acid, maleic acid, Fumaric acid, methacrylic acid, ethylmethacrylic acid, hydroxymethylacrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate Bit, 2-hydroxyethyl methacrylate, the at least one selected from the group consisting of 2-hydroxypropyl methacrylate may be used.

In the present invention, the surfactant and the initiator are not particularly limited as long as they are generally used for producing a water-soluble acrylic pressure-sensitive adhesive. However, the surfactant may be selected from the group consisting of monoalkyl sulfates, alkyl polyoxyethylene sulfates An anionic surfactant including alkylbenzenesulfonate and sodium dodecyl sulfate or a nonionic surfactant such as polyoxyethylene alkyl ether may be used and the initiator may be sodium peroxodisulfate Ammonium persulfate, sodium bicarbonate, potassium persulfate, and sodium bisulfate may be used.

Meanwhile, the pressure-sensitive adhesive composition of the present invention includes a friction modifier together with a water-soluble acrylic pressure-sensitive adhesive. In the present invention, the friction modifier prevents the pressure-sensitive adhesive from being impregnated into the nonwoven sheet without deteriorating the adhesive property of the acrylic pressure- In addition, when a nonwoven fabric sheet containing a pressure-sensitive adhesive composition is provided as a cleaning adhesive sheet, it is very important to reduce frictional force against the cleaning surface.

However, in the present invention, the friction modifier is preferably included in an amount of 5 to 20 parts by weight based on 100 parts by weight of the acrylic pressure-sensitive adhesive. If the content of the friction modifier is less than the above range, the effect of lowering the frictional force may be limited. If the content of the friction modifier is more than the above range, . ≪ / RTI >

In the present invention, the friction modifier specifically includes lauric acid; And polyethylene glycol or polypropylene glycol having a number average molecular weight of 300 to 3,000. That is, the friction modifier of the present invention may be a mixture of lauric acid and polyethylene glycol, or a mixture of lauric acid and polypropylene glycol, and a mixture of lauric acid and polyethylene glycol may be preferred in terms of production unit cost. In the present invention, the number average molecular weight of the present invention may mean a value measured by the end group determination method, the total utilization measurement method, or the osmotic pressure method. When the number average molecular weight is a monomolecular group that does not fall within the above range, It may be absorbed and the possibility of harm to the human body may be worried.

In the present invention, the polyethylene glycol or polypropylene glycol is preferably mixed in a proportion of 50 to 85 parts by weight based on 100 parts by weight of the lauric acid. In this range, since the mixture of lauric acid and polyhydric alcohol is in a gel state, And is also excellent in compatibility with a water-soluble acrylic pressure-sensitive adhesive. If the proportion of the lauric acid exceeds the above range, the state after the compounding is solid and is difficult to dissolve in water. When the ratio of polyethylene glycol or polypropylene glycol is more than the above range, phase separation with a water-soluble acrylic pressure- It may be difficult to form a pressure-sensitive adhesive composition. More preferably, the lauric acid is mixed at a weight ratio of polyethylene glycol or polypropylene glycol to 65 (ratio of lauric acid): 35 to 55:45.

In order to apply the pressure-sensitive adhesive composition to the nonwoven fabric sheet in the present invention, the pressure-sensitive adhesive composition is dissolved in a solvent such as water or alcohol to prepare a treatment solution, then the nonwoven fabric sheet is padded to the solution, A spraying method can be used. However, the impregnation method may be more advantageous in order to facilitate permeation of the adhesive composition to the deep portion of the nonwoven fabric sheet.

When the pressure-sensitive adhesive composition is dissolved in a solvent, it is preferable that the concentration of the pressure-sensitive adhesive composition is in the range of 10 to 20% for easy dispersion of the pressure-sensitive adhesive composition against the solvent and uniform coating on the fibers forming the nonwoven sheet. This may ultimately be important in terms of being able to simultaneously impart excellent adhesion and low friction to the nonwoven fabric sheet. If the concentration is too low, the pick-up rate should be increased and thus a lot of energy may be consumed for drying. If the concentration is too high, penetration of the inside of the nonwoven fabric sheet due to high viscosity may become difficult, .

However, in the present invention, when the friction modifier is less than 5 to 20 parts by weight based on 100 parts by weight of the acrylic pressure-sensitive adhesive, undesirable problems may occur after being applied to the nonwoven sheet even if the concentration of the pressure- . That is, when the content of the friction modifier is less than 5 parts by weight based on 100 parts by weight of the acrylic pressure sensitive adhesive, the effect of improving the frictional force is insufficient. When the content of the friction modifier is more than 20 parts by weight, As a result, as shown in FIG. 3, the surface of the nonwoven fabric sheet may be partially aggregated and may be rather stained.

On the other hand, when the nonwoven fabric sheet is impregnated with the pressure-sensitive adhesive composition, the speed of the nonwoven fabric sheet passing through the impregnation tank is preferably 10 to 20 meters / min in consideration of sufficient impregnation and proper pick-up. It is also preferable that the nonwoven fabric sheet impregnated with the pressure-sensitive adhesive composition is squeezed by pressing the rollers to pick up the pressure-sensitive adhesive composition at a uniform pick-up rate over the entire width of the sheet. After squeezing, it is preferable to control the roller pressure so that the solution remains on the nonwoven sheet in a proportion of 90 to 120% on the weight of fiber (OWF), wherein OWF is the amount of the adhesive composition remaining on the non- It is preferable to appropriately control in advance according to the concentration of the solution.

After the squeeze treatment, drying may be performed to evaporate the solvent contained in the treatment solution. The adhesive composition is stuck to the surface of the staple fiber forming the nonwoven fabric sheet while being dried, and is not released upon use, while being dried. According to the present invention, the drying may be carried out according to the thickness of the nonwoven fabric. Preferably, the drying is carried out at a drying temperature of 110 to 140 ° C. and a drying time of 30 to 60 seconds, It is suitable for vaporizing only the solvent. That is, if it is dried at a high temperature for a long time, the water-soluble adhesive component hardens hardly to deteriorate the adhesive property. However, when the drying is performed under the above conditions, the dry water content of the nonwoven fabric can be controlled to less than 5% There is no concern and it is preferable.

The pressure-sensitive adhesive sheet thus produced may contain 10 to 20 parts by weight of the pressure-sensitive adhesive composition based on 100 parts by weight of the nonwoven fabric sheet based on the dry weight. If the content of the adhesive composition is too low to control the production conditions and the adhesive composition does not reach the content range described above, the effect of improving the adhesive force or the frictional force may be insufficient, or the content of the adhesive composition may be excessively excessive, Secondary contamination can be a concern. The adhesive composition of the present invention may be in a state of being physically bonded to the surface of the fibers forming the nonwoven fabric sheet and coated.

In the present invention, the nonwoven fabric sheet has a staple fiber having a fineness of 3 to 50 Deniers forming a web. More specifically, the nonwoven fabric sheet may be made of polyester (PET), polypropylene (PP), nylon ) And rayon (Raylon). The staple fibers may be manufactured by needle-punching at least one kind of staple fibers.

At this time, considering safety required for the cleaning non-woven fabric and bulkiness, the staple fiber may use two or more types of staple fibers having different finenesses in the range of 3 to 50 Deniers. When a nonwoven fabric is formed using staple fibers having different finenesses, the web can be formed more complicatedly, which can improve the elasticity, and the soft touch feeling of the low-fineness fibers and the high fineness of the fibers A sense of stability can be secured at the same time.

Needle punching, spunlace, thermal bond, chemical bond, meltblown, and the like can be used as a method of forming a web with staple fibers to form a nonwoven fabric. The method for producing the nonwoven fabric is not necessarily limited. However, when considering the form stability of the nonwoven fabric sheet and the formation of a web structure capable of easily penetrating the pressure sensitive adhesive composition, the nonwoven fabric sheet of the present invention can be produced by needle punching It may be most advantageous to choose.

In the present invention, the nonwoven fabric sheet preferably has a dry weight of 50 to 100 g and a height of 2 to 5 mm per unit area (m 2) in view of easy penetration of the adhesive composition and uniform coating. However, when the dry weight or height is less than the above range, it is too light to provide a stable feeling of use, or the nonwoven fabric has a stiff form, which may cause inconvenience in cleaning, and it may be difficult to control the proper content of the pressure- . In order to easily control the dry weight and height per unit area of the nonwoven fabric sheet, it is preferable that the staple fiber has a dry weight of 30 to 300 g / m ² and a fiber length of 15 to 51 mm have.

As described above, the pressure-sensitive adhesive sheet of the present invention is improved so as not to be inconvenient for cleaning the frictional force with the cleaning surface compared to the conventional sheet, while securing excellent adhesive force, and can exhibit excellent performance as a cleaning cloth. The pressure-sensitive adhesive sheet of the present invention may be manufactured into one or more of a wrapped shape of a cylindrical winding roll, a layered structure inside a box-shaped frame, and a separately packaged state for each unit sheet for convenience of use.

Example

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood by those skilled in the art that these embodiments are only for illustrating the present invention and that the scope of the present invention is not construed as being limited by these embodiments.

Preparation Example  1. Preparation of water-soluble acrylic pressure-sensitive adhesive

Water-soluble acrylic pressure-sensitive adhesive was polymerized using 210 g of water as a solvent and using an acrylic monomer, a surfactant and an initiator as shown in Table 1 below.

Water-soluble acrylic pressure-sensitive adhesive component Amount
(g) ratio
(weight%) Initiator _{(NH 4) 2 S 2 O} 8 Ammonium persulfate 1.98 1.15 NaHCO ₃ Sodium bicarbonate 5.2 3.03 Surfactants Nonionic surfactant - 5.03 2.93 Anionic surfactant Sodium dodecyl sulfate 4.5 2.62 Acrylic monomer 2-EHA 2-Ethylhexyl acrylate 95.0 55.33 BA n-Butyl acrylate 35.0 20.38 MAA Methacrylic acid 15.0 8.74 AA Acrylic acid 10.0 5.82 Sum 171.71 100

Preparation Example  2. Preparation of friction modifier

Next, a friction modifier was prepared by mixing lauric acid (purified gold, Lauric acid 98%) and polyethylene glycol (Polymer Glycol 2000) in the ratios shown in Table 2 below. However, when the content of lauric acid was too high as in Comparative Preparation Examples 2-1 to 2-4, it was in a solid state and did not dissolve in water. When the content of polyethylene glycol was high, dissolution in water was possible, 1 with water-soluble acrylic pressure-sensitive adhesive. As a result, Comparative Preparation Examples 2-1 to 2-4 could not be used as friction modifiers.

division Composition ratio compare
Preparation Example
2-1 compare
Preparation Example
2-2 Preparation Example
2-1 Preparation Example
2-2 Preparation Example
2-3 compare
Preparation Example
2-3 compare
Preparation Example
2-4 Lauric acid 75% 70% 65% 60% 55% 50% 40% Polyethylene Glycol 25% 30% 35% 40% 45% 50% 60% immixture solid solid Gel Gel Gel Liquid phase Liquid phase Water dissolving Melting x Melting x Dissolution Dissolution Dissolution Dissolution Dissolution When water-soluble acrylic adhesive is added Melting x Melting x Dissolution Dissolution Dissolution Phase separation ¹⁾ Phase separation

1) Phase separation: The state of the processing solution (water + water-soluble pressure-sensitive adhesive + oil) is not spread evenly,

Manufacturing example . Production of adhesive composition

As shown in Table 3 below, polypropylene glycol (polypylene glycol 2,000), ethylene glycol (propylene glycol, 99% ethylene glycol), propylene glycol (propylene glycol, propylene glycol 99.5% ) Can be combined with lauric acid in the same proportions as those in Preparation Example 2-2, and water-soluble silicone oil (KCC silicone SI4000Z), water-soluble paraffin oil (paraffin oil: WO05050 30%, emulsifier: enriched GDO-350 5%, water 70%) was selected as a friction modifier and dissolved in water together with the water-soluble acrylic pressure-sensitive adhesive of Preparation Example 1 above. However, except for the addition of polypropylene glycol (Production Example 2), there was concern about human harm or phase separation with water-soluble acrylic pressure-sensitive adhesive.

division Production Example 1
(Preparation Example 2-1) Production Example 2 compare
Production Example 1 compare
Production Example 2 compare
Production Example 3 compare
Production Example 4 ingredient lauric acid
+ PEG lauric acid
+ PPG lauric acid
+ EG lauric acid
+ PC receptivity
silicon
oil receptivity
paraffin
oil Water dissolving Dissolution Dissolution Dissolution Dissolution Dissolution Dissolution When water-soluble acrylic adhesive is added Dissolution Dissolution Dissolution Dissolution Phase separation Phase separation Human hazard - - Possible human hazard Possible human hazard - -

Reference example

Prior to the full-scale experiment, adhesion and frictional force according to the content of the pressure-sensitive adhesive were measured (see method for measuring physical properties, below) when a pressure-sensitive adhesive sheet was produced using only water-soluble acrylic pressure-sensitive adhesive. The nonwoven fabric sheet used was a nonwoven fabric sheet (60 g dry weight per unit area (m 2) and 3 mm in volume) prepared by needle punching PET fibers having a fineness of 15 Denier and PET fibers having a density of 30 Denier, As a control group, the measurement results were compared. The results are shown in Table 4 below.

≪ Method for measuring physical properties &

(1) Adhesion (dust adhesion rate, % ) Measurement: 2 g of an adherend (sand, particle size 300 to 600 μm) was uniformly sprayed on a vinyl floor (45 cm * 180 cm) The adhesive sheet was used as a test specimen (120 * 470 mm) to clean the deposited vinyl floor. The pressure (force) applied during cleaning was the same in all experiments. After the cleaning was completed, the specimen was measured in comparison with the weight measured before cleaning, and the adhesion rate (adhesion rate) of the adherend was calculated Respectively.

(%) = [(W ₃ -W ₂ ) / W ₁ ] * 100

In this case, W ₁ = the total weight of the adhered material (2 g) sprinkled in a certain area, W ₂ = the weight of the sample before the test (cleaning), and W ₃ = the weight of the sample after the test (cleaning).

(2) Measurement of frictional force ( kgf ) The static frictional coefficient and the frictional coefficient, which are defined as follows according to ASTM D1894 or ISO 8295, were measured and frictional force grades were evaluated by dividing the measured frictional coefficient by three criteria .

- Static frinction coefficient: The ratio of the frictional force acting on the contact surface and the force acting as the perpendicular force when the relative motion is started in the stationary state

- dynamic friction coefficient: the ratio of the friction force acting on the contact surface of the friction state and the force acting as the vertical force

≪ Evaluation Criteria of Friction Force Rating: Standard of Friction Coefficient >

① Less than 1.0kgf (upper): It has no feeling of adhesion and can be cleaned without force

② Above 1.0kgf ~ 2.0kgf (middle): It is possible to clean, but there is an inconvenience due to the adhesive force.

③ Over 2.0kg (bottom): I feel inconvenience that the cleaning nonwoven fabric is completely close to the cleaning surface and can not be cleaned.

Water-soluble acrylic adhesive content
(%, Non-woven fabric dry weight 100) Dust adhesion rate
(%) Constant friction coefficient
(Kgf) Friction rating Control group 0 3.5 0.35 Prize Reference Example 1 2 64.5 1.12 medium Reference Example 2 4 77.4 1.23 medium Reference Example 3 6 86 1.37 medium Reference Example 4 8 87.5 1.41 medium Reference Example 5 10 93.5 2.23 Ha Reference Example 6 15 93.7 2.51 Ha Reference Example 7 20 94.1 3.05 Ha Reference Example 8 25 94.3 4.01 Ha Reference Example 9 30 94.5 4.51 Ha Reference Example 10 35 94.5 5 (MAX) Ha

According to the results of producing the pressure sensitive adhesive sheet using only the water soluble acrylic pressure sensitive adhesive, when the content of the pressure sensitive adhesive was 10% or more, the dust adhesion rate was excellent at 90% or more, but the frictional force grade was " And it was confirmed that they felt the inconvenience caused by.

Example  1 and Comparative Example  One

Among the friction modifiers which were judged to be satisfactory according to Preparation Example 2 and Preparation Example, the friction modifier of Preparation Example 2-2 was selected and dissolved in water together with the water-soluble acrylic pressure-sensitive adhesive of Preparation Example 1. [ At this time, the concentration of the water-soluble acrylic pressure-sensitive adhesive was fixed at 10%, which is a reference point at which the adhesive strength of 90% or more in the reference example was started, and the concentration of the friction-improving agent was 0%, 1%, 2%, 3% To prepare six kinds of adhesive composition solutions (judging the whole solution as 100%). Next, the same nonwoven fabric sheet as that used in the reference example was prepared, the nonwoven fabric sheet was impregnated with the adhesive composition solution, and then subjected to squeeze treatment with 100% O.W.F. Then, it was dried at 120 DEG C for 30 seconds to prepare a pressure-sensitive adhesive sheet having a dry moisture content of 0.01%.

Example  2 and Comparative Example  2

An adhesive cleaning nonwoven fabric was prepared in the same manner as in Example 1 and Comparative Example 1, except that the concentration of the water-soluble acrylic pressure-sensitive adhesive was changed to 15%.

Example  3 and Comparative Example  3

An adhesive cleaning nonwoven fabric was prepared in the same manner as in Example 1 and Comparative Example 1, except that the concentration of the water-soluble acrylic pressure-sensitive adhesive was changed to 18%.

Comparative Example  4

An adhesive cleaning nonwoven fabric was prepared in the same manner as in Example 1 and Comparative Example 1, except that the concentration of the water-soluble acrylic pressure-sensitive adhesive was changed to 20%.

The dust adhesion rate (adhesive force) and static friction coefficient were measured for the above Examples 1 to 3 and Comparative Examples 1 to 4, and the results are shown in Table 5.

division Acrylic adhesive friction
Improvement agent dust
Adhesion rate (%) Constant friction coefficient
(kgf) Remarks Control group X X 3.5 0.35 - Comparative Example 1-1
(Reference Example 5) 10% 0% 93.00 2.23 - Example 1-1 10% One% 93.50 0.75 No burial. Examples 1-2 10% 2% 99.10 0.55 No burial. Comparative Example 1-2 10% 3% 88.60 0.44 Friction improver stains and sheet stains occur Comparative Example 1-3 10% 4% 82.50 0.52 Friction improver stains and sheet stains occur Comparative Example 1-4 10% 6% 80.00 0.92 Friction improver stains and sheet stains occur Comparative Example 2-1
(Reference Example 6) 15% 0% 93.70 2.51 - Example 2-1 15% One% 94.80 0.78 No burial. Example 2-2 15% 2% 99.60 0.58 No burial. Example 2-3 15% 3% 90.25 0.51 No burial. Comparative Example 2-2 15% 4% 81.00 0.52 Friction improver stains and sheet stains occur Comparative Example 2-3 15% 6% 79.00 0.80 Adhesive and friction improver stains and sheet stains occur Comparative Example 3-1 18% 0% 94.00 3.25 - Example 3-1 18% One% 94.70 1.0 No burial. Example 3-2 18% 2% 99.30 0.98 No burial. Comparative Example 3-2 18% 3% 85.20 0.82 Adhesive Bury Comparative Example 3-3 18% 4% 83.10 0.70 Adhesive and friction improver stains and sheet stains occur Comparative Example 3-4 18% 6% 77.20 0.65 Adhesive and friction improver stains and sheet stains occur Comparative Example 4-1
(Reference Example 7) 20% 0% 94.10 3.05 - Comparative Example 4-2 20% One% 94.80 1.52 Adhesive Bury Comparative Example 4-3 20% 2% 98.00 1.00 Adhesive Bury Comparative Example 4-4 20% 3% 88.70 1.05 Adhesive Bury Comparative Example 4-5 20% 4% 82.00 0.89 Adhesive and friction improver stains and sheet stains occur Comparative Example 4-6 20% 6% 76.50 0.99 Adhesive and friction improver stains and sheet stains occur

As can be seen from Table 5, when the friction modifier is added together with the water-soluble acrylic pressure-sensitive adhesive, the coefficient of static friction is lowered. Particularly, as a result of measuring the static friction coefficient and the dynamic friction coefficient according to the moving distance from the cleaning start point using the pressure-sensitive adhesive sheets of Examples 1-1 to 1-2 and Comparative Examples 1-1 to 1-4, In the same graph, the use of the friction modifier showed that the adhesive sheet exhibited almost the same behavior as the nonwoven fabric sheet (control group) having no tackiness component, so that the cleaning force was less likely to be applied and the cleaning efficiency could be improved .

However, when the ratio of the friction modifier exceeds 20% (Comparative Examples 1-2, 1-3, 1-4, 2-2, 2-3, 3-3, 3-4, 4-6) When the friction modifier is partially aggregated or the adhesive force is lowered and the total amount of the adhesive composition exceeds 20% of the dry weight of the nonwoven fabric sheet (Comparative Examples 3-2 to 3 -4, and Comparative Examples 4-2 to 4-6), the pressure-sensitive adhesive was found to be on the cleaning surface, resulting in deterioration of adhesion and secondary contamination.

On the other hand, in the case of the example produced according to the present invention, it was confirmed that the cleaning agent can be smoothly cleaned with excellent adhesive force without causing a sticking agent or a friction improver to appear on the cleaned surface.

Add Experimental Example (Field test)

An independent space of at least 20m ² of vinyl floor was prepared, and the space was allowed to stand for 2 weeks to occur naturally on the cleaned surface of the adherend. Test specimens (120 * 470 mm) were prepared for the above Comparative Examples 1-1 to 1-4 and Examples 1-1 to 1-2 and attached to a holder, and then the same area of ² m ² was cleaned. After the cleaning was completed, the adhesion state of the adhesive sheet and the feeling of use were compared.

As a result, in the case of the control group in which the adhesive composition was not used at all as shown in FIG. 2, it was possible to smoothly clean but the cleaning power was insufficient. In the case of Comparative Example 1-1, the cleaning power was excellent, I was not feeling well. Further, in the case of Comparative Examples 1-2 to 1-4, it was confirmed that the cleaning power was not good enough to be visually confirmed, rather, the friction improving agent appeared (see FIG. 3) .

Claims (6)

A nonwoven fabric sheet having a web formed by a staple fiber having a fineness of 3 to 50 Denier; And a pressure-sensitive adhesive composition in which a coating layer is formed on the surface of the staple fibers forming the nonwoven fabric sheet,
The pressure-sensitive adhesive composition according to claim 1, wherein the pressure-sensitive adhesive composition comprises: 100 parts by weight of a water-soluble acrylic pressure-sensitive adhesive; lauric acid; And 5 to 20 parts by weight of a friction modifier mixed with polypropylene glycol having a number average molecular weight of 2000 to 3000,
Wherein the lauric acid is contained in a weight ratio of polypropylene glycol and 65 (ratio of lauric acid): 35 to 55:45.
delete The pressure-sensitive adhesive sheet according to claim 1, wherein the pressure-sensitive adhesive composition comprises 10 to 20 parts by weight per 100 parts by weight of the nonwoven fabric sheet.
The staple fiber according to claim 1, wherein the staple fiber is at least one fiber selected from the group consisting of polyester (PET), polypropylene (PP), nylon, and rayon. Sheet.
The nonwoven fabric sheet according to claim 1, wherein the nonwoven fabric sheet has a web formed by needle punching and has a dry weight of 50 to 100 g and a height of 2 to 5 mm per unit area (m 2) Adhesive sheet.
The pressure-sensitive adhesive sheet according to claim 1, wherein the pressure-sensitive adhesive sheet is produced in at least one of a form wound on a cylindrical winding roll, a layer stacked in a box-shaped mold, and a packed state individually packaged in each unit sheet.

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